86 research outputs found

    Levetiracetam Reverses Synaptic Deficits Produced by Overexpression of SV2A

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    Levetiracetam is an FDA-approved drug used to treat epilepsy and other disorders of the nervous system. Although it is known that levetiracetam binds the synaptic vesicle protein SV2A, how drug binding affects synaptic functioning remains unknown. Here we report that levetiracetam reverses the effects of excess SV2A in autaptic hippocampal neurons. Expression of an SV2A-EGFP fusion protein produced a ∼1.5-fold increase in synaptic levels of SV2, and resulted in reduced synaptic release probability. The overexpression phenotype parallels that seen in neurons from SV2 knockout mice, which experience severe seizures. Overexpression of SV2A also increased synaptic levels of the calcium-sensor protein synaptotagmin, an SV2-binding protein whose stability and trafficking are regulated by SV2. Treatment with levetiracetam rescued normal neurotransmission and restored normal levels of SV2 and synaptotagmin at the synapse. These results indicate that changes in SV2 expression in either direction impact neurotransmission, and suggest that levetiracetam may modulate SV2 protein interactions

    Nutritional and herbal supplements for anxiety and anxiety-related disorders: systematic review

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    <p>Abstract</p> <p>Background</p> <p>Over the past several decades, complementary and alternative medications have increasingly become a part of everyday treatment. With the rising cost of prescription medications and their production of unwanted side effects, patients are exploring herbal and other natural remedies for the management and treatment of psychological conditions. Psychological disorders are one of the most frequent conditions seen by clinicians, and often require a long-term regimen of prescription medications. Approximately 6.8 million Americans suffer from generalized anxiety disorder. Many also suffer from the spectrum of behavioural and physical side effects that often accompany its treatment. It is not surprising that there is universal interest in finding effective natural anxiolytic (anti-anxiety) treatments with a lower risk of adverse effects or withdrawal.</p> <p>Methods</p> <p>An electronic and manual search was performed through MEDLINE/PubMed and EBSCO. Articles were not discriminated by date of publication. Available clinical studies published in English that used human participants and examined the anxiolytic potential of dietary and herbal supplements were included. Data were extracted and compiled into tables that included the study design, sample population, intervention, control, length of treatment, outcomes, direction of evidence, and reported adverse events.</p> <p>Results</p> <p>A total of 24 studies that investigated five different CAM monotherapies and eight different combination treatments and involved 2619 participants met the inclusion criteria and were analyzed. There were 21 randomized controlled trials and three open-label, uncontrolled observational studies. Most studies involved patients who had been diagnosed with either an anxiety disorder or depression (n = 1786). However, eight studies used healthy volunteers (n = 877) who had normal levels of anxiety, were undergoing surgery, tested at the upper limit of the normal range of a trait anxiety scale, had adverse premenstrual symptoms or were peri-menopausal, reported anxiety and insomnia, or had one month or more of elevated generalized anxiety. Heterogeneity and the small number of studies for each supplement or combination therapy prevented a formal meta-analysis. Of the randomized controlled trials reviewed, 71% (15 out of 21) showed a positive direction of evidence. Any reported side effects were mild to moderate.</p> <p>Conclusions</p> <p>Based on the available evidence, it appears that nutritional and herbal supplementation is an effective method for treating anxiety and anxiety-related conditions without the risk of serious side effects. There is the possibility that any positive effects seen could be due to a placebo effect, which may have a significant psychological impact on participants with mental disorders. However, based on this systematic review, strong evidence exists for the use of herbal supplements containing extracts of passionflower or kava and combinations of L-lysine and L-arginine as treatments for anxiety symptoms and disorders. Magnesium-containing supplements and other herbal combinations may hold promise, but more research is needed before these products can be recommended to patients. St. John's wort monotherapy has insufficient evidence for use as an effective anxiolytic treatment.</p

    Ansiedade dos estudantes diante da expectativa do exame vestibular

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    Este estudio investigó la ansiedad de los estudiantes en las escuelas privadas en un estado de Brasil en el examen de ingreso. La muestra fuese compuesta de 124 estudiantes de la escuela secundaria participantes del PISM (Proceso de Admisión Común), siendo 66 mujeres e 58 hombres, 69 alumnos del 1er año de escuela secundaria y 55 del 3er año. Los estudiantes respondieron a un cuestionario socio-demográfico y al Inventario de Ansiedad Rasgo-Estado (IDATE), en sus propias aulas. Hubo una diferencia significativa en relación con el género (p=0,036) que se encontró un mayor nivel de ansiedad estado en el 1er año de las mujeres en comparación con los hombres del 1er año (p = 0,004). El mismo resultado se encontró con respecto a la ansiedad-rasgo: las mujeres de 1er año son más ansiosas que los hombres del 1er año (p=0,000).O presente estudo investigou a ansiedade dos jovens estudantes de escolas particulares de um estado do Brasil em relação ao exame vestibular. A amostra foi composta por 124 estudantes do ensino médio participantes do vestibular seriado PISM (Processo de Ingresso Seletivo Misto), sendo 66 do gênero feminino e 58 do gênero masculino, 69 alunos do 1º ano do ensino médio e 55 do 3º ano. Os estudantes responderam a um questionário sócio-demográfico e ao Inventário de Ansiedade Traço-Estado (IDATE) na suas próprias salas de aula. Foi observada uma diferença significativa quanto ao gênero (p=0,036) sendo que foi encontrado um maior nível de ansiedade-estado nas mulheres do 1º ano comparativamente aos rapazes do 1ºano (p=0,004). O mesmo resultado foi encontrado com relação à ansiedade-traço: moças do 1º ano são mais ansiosas do que rapazes do 1º ano (p=0,000).This study investigated the anxiety of private schools students at the expectation of attending colleges' entrance examination in one Brazilian state. The sample consisted of 124 high school students participating in the PISM series of examination (Joint Selective Admission Process). They were 66 females and 58 males, 69 students from the 1st year and 55 from the 3rd year. Students answered a sociodemographic questionnaire and the State-Trait Anxiety Inventory in their respective classrooms. A significant difference regarding gender (p=0.036) was found, women from the 1st year presented higher levels of state-anxiety compared to men from the 1st year (p=0.004). The same result was found with respect to the trait-anxiety, women from the 1st year were more anxious than men from the 1st year (p=0.000)

    Eicosapentaenoic acid/docosahexaenoic acid

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